Background

In Unicode 5.0, the list of characters with the Bidi_Mirrored
property was made consistent for brackets and quotation marks, in
preparation for new constraints on bidi mirroring. (For more background information
on the affected characters, see
Public Review Issue #80,
Proposed Update to UAX #9: The Bidirectional Algorithm.) However,
after publication of Unicode 5.0.0 it was discovered that this change
adversely affected several
quotation mark characters in deployed data.

Changes to Bidi Mirroring

When this corrigendum is applied to Unicode 5.0.0, the Bidi_Mirrored property of
the characters 2018..201F and 301D..301F is changed to "false" and their
Bidi_Mirroring_Glyph is adjusted accordingly. Make the following changes to
data files:

1. Change the 11 lines in UnicodeData.txt which define properties for these characters to have the
following contents: